Multiple autocomplete fields

Agreed. For Drupal.org, we want to autocomplete separately on project name, related users, and tags. For Views, I don't really understand the use case of searching across all enabled fields, rather than just the one filter that the user is typing in.

Nevermind, I see the "Fields to use" setting can be left blank.

Is this possible? I have multiple fulltext search filters that work on different fields. When I enable and configure this module, it puts an autocomplete on the first one only. Is there anyway to put it on all of them, and return appropriate results?

I have fixed this (patch attached). The problem was that I used multiple fulltext search filters (on different fields), but the code as it was would only detect the first one. Subsequent ones would be named e.g. 'search_api_views_fulltext_1', 'search_api_views_fulltext_2' etc. but the code was simply adding this:

$fields[] = 'search_api_views_fulltext';

and then finding that field like so:

$view->filter[$field]

So it never saw the ones named 'search_api_views_fulltext_1' etc.

I rewrote it to instead loop over each of the filters the view has, and check if the real_field (which is 'search_api_views_fulltext' for all of them) is in the $fields array.

Looks good, thanks! A quick test also seems to verify this works correctly.
Just one bug, I think:

+++ b/search_api_autocomplete.search_api_views.inc
@@ -30,21 +30,19 @@ function search_api_autocomplete_form_views_exposed_form_alter(array &$form, arr
+          else {
+            $autocomplete_fields = array($filter_name);
+          }

Unless I'm mistaken, the array should contain $filter->real_field, not the Views filter name (which will often be something different).
The attached patch would fix this, please test it again and I can commit it.
(Would be great to get some more reviews, to make sure this doesn't break anything, but unfortunately testers are hard to come by.)

PS: For the future: When you post a patch, please set the issue status to "Needs review" so I know there's something to look at.

Could you, or someone else, please test this and verify it works?

I would have preferred at least one final review, but it will probably be OK.
Committed.
Still, thanks again for the patch!

Sorry, I've been very busy. I just tested it and your patch works. Thanks.